Nanocrystalline Titanium(IV) Oxide as an Efficient Heterogeneous Catalyst for Tandem Michael and Nucleophilic 1,2-Addition to Enones
作者:M. Lakshmi Kantam、Soumi Laha、Jagjit Yadav、B. M. Choudary、B. Sreedhar
DOI:10.1002/adsc.200505415
日期:2006.5
Nanocrystallinetitanium(IV) oxide was found to be an efficientheterogeneouscatalyst for the conjugate 1,4-addition of indoles with α,β-unsaturated ketones to afford β-indolyl ketones in excellent yields. The subsequent catalytic 1,2-addition of Me3SiCN to carbonyl compounds can be performed in one pot with moderate to good yields. Low sensitivity towards traces of moisture and high tolerance of